The Back Door

The Back Door is an Easter Egg in Cabin Subject, which can serve many functions depending on various circumstances. It is located in the Cabin, exiting from beside the Bedroom door. It typically cannot be opened, and requires specific functions to unlock it.

Night 50
The most common occurrence of the door opening is when you complete night 50. This will happen the very next round once, and never after that. On the steps of the back door will be a card, which when clicked will read: "Every Night. You've seen those lights. Aren't they beautiful". When you try to close the message, your screen will flash red for a second, then go black entirely.

Red White & Blue Key
This event can be unlocked when you obtain both a Red Key and a Blue Key, and instead attempt lodging them both in the Back Door. Dragging them across each other will turn either of the keys white, in which you can click to open the door with. Instead of actually opening, it will turn into a wall of white neon, which apon walking through will lead to a blank white room. You soon start to fall through a black-and-white tunnel that seemingly goes on forever, although it will eventually end by dropping you into the map center. Returning to your house, the door will be closed.

Jim/Jan
During the Halloween and Christmas events, if you unlocked the door using the other methods, including the RWB method, a scarecrow would appear infront of your front window with Jim or Jan on it's head. It cannot be flashed away, doing so will cause it to give out a horrible roar.